Electricity: circuit makers and breakers – Fluid pressure – Flow-responsive type
Patent
1997-08-11
1999-08-17
Tolin, Gerald
Electricity: circuit makers and breakers
Fluid pressure
Flow-responsive type
7386176, 29622, 277318, 2003023, H01H 3540
Patent
active
059396881
ABSTRACT:
A fluid responsive switch having a pivot arm for monitoring fluid flowing in a conduit or the level of liquid in a container with an improved resilient seal. The pivot arm, in the fluid responsive switch, is mounted in a housing by a pivot pin and a resilient elastomer seal molded around the pivot arm and the pivot pin. To improve the bond of the resilient seal, the surface of the pivot arm is cross-cut to provide a plurality of grooves diagonal to the axis of the pivot arm. A further improvement to the seal is provided by circumferential annular grooves in the pivot arm at each end of the cross-cut surface. The circumferential annular grooves act as retention stops to retain the resilient material in the groove and resist shear stresses and peeling tension and increase the contact surface area of the metal to resilient elastomer bond. The circumferential annular grooves are cut in the surface of the pivot arm at each end of the cross-cut surface to improve the metal to elastomer material bond. An optional, but preferred feature of the invention is to provide a peripheral ridge molded around an upper surface of the seal to provide an O-ring type seal in an annular groove in a mounting plate. The molded peripheral ridge acts as an integrally formed dynamic O-ring seal.
REFERENCES:
patent: 3501605 (1970-03-01), Hutchinson
patent: 3845259 (1974-10-01), Spurr
patent: 3898397 (1975-08-01), Devore
patent: 4074097 (1978-02-01), Hutchinson
patent: 4109126 (1978-08-01), Halbeck
patent: 4454398 (1984-06-01), Aschenbach
patent: 4725700 (1988-02-01), Zoludow
Harwil Corporation
O'Reilly David
Tolin Gerald
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